When unplugging the Trunk Master the slave goes "In_Sync"

We are moving to new core switches and thus swinging the edge switch ISLs across. We have connected the new cores to the old cores and are moving one ISL at a time.

Some of our edge switches have 2 sets of trunks using ports 0&1 and 30&31. We have seen that if you unplug the Trunk Master then the slave goes into an In_Sync state. If you disable & re-enable then it comes back ok as the trunk master. I would have expected the slave to just take over as trunk master dynamically. Unplugging the slave has no impact on the trunk master.

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